To be fair, they do admit this: "Are you challenging Twitter’s earnings report, saying that <5% of mDAUs are fake/spam? We are not disputing Twitter’s cla

To be fair, they do admit this: "Are you challenging Twitter’s earnings report, saying that <5% of mDAUs are fake/spam? We are not disputing Twitter’s claim. There’s no way to know what criteria Twitter uses to identify a “monetizable daily active user” (mDAU) nor how they classify “fake/spam” accounts. We believe our methodology (detailed above) to be the best system available to public researchers. But, internally, Twitter likely has unknowable processes that we cannot replicate with only their public data."